# Sieyuan SYPB-820 Transformer Differential Protection Relay

> transformer-protection - Two- and three-winding transformer differential and backup protection with comprehensive harmonic restraint and tap changer monitoring

**Voltformer canonical:** https://voltformer.com/product/sieyuan-sypb-820-transformer-differential-protection-relay - markdown version: https://voltformer.com/product/sieyuan-sypb-820-transformer-differential-protection-relay.md

## Overview

- **Brand:** Sieyuan Electric
- **Product family:** SYPB Series
- **Application:** Two- and three-winding transformer differential and backup protection with comprehensive harmonic restraint and tap changer monitoring
- **Product type:** transformer-protection

## Protection & Control Functions

- **ANSI Functions:** 87T, REF/87N, 49, 50/51, 50N/51N, 24, 50BF
- **Transformer Windings:** 2, 3
- **Supports Transformer:** Yes
- **Supports Feeder:** No
- **Supports Breaker Control:** Yes
- **Arc Flash Protection:** No

## Digital Integration & Protocols

- **IEC 61850 Edition:** Ed2
- **GOOSE:** Yes
- **Sampled Values (SV):** Yes
- **Redundancy (PRP/HSR):** Yes (PRP/HSR)
- **Protocols:** IEC 61850, GOOSE, IEC 60870-5-103, Modbus
- **Engineering Software:** Sieview Pro

## Electrical Interface

- **Frequency:** 50/60 Hz
- **Nominal Current:** 1 A / 5 A
- **Auxiliary Supply:** 110-220 Vdc
- **Operating Temperature:** -25 to +55 °C

## Standards

- IEC 60255
- IEC 61850
- KEMA Onaylı

## Sources

- https://www.sieyuan.com

- **Source scope:** manufacturer-family
- **Last reviewed:** 2026-09-13

Manufacturer portfolio/family source. Confirm the exact order code, guaranteed ratings and project-specific options against the current OEM datasheet before procurement or an SLD study.

Technical ratings are configuration-dependent where stated by the manufacturer. Request project-specific verification before procurement.